OPTIMA RedTop^™ batteries are designed for short term high current applications such as starting engines, like those ones shown above or your car in the middle of winter! They can be left for months, in the depths of winter and will start even the most high compression race engine, or agricultural diesel engine first time!

They are excellent at delivering very high starting currents in the most extreme of conditions. They suffer less damage from deep discharge, long term storage, and vibration than any conventional battery. They are not specifically designed as "deep-cycle" batteries, for constant deep discharge/recharge cycles you will need to look at our YellowTop Optima batteries. But this Red Top battery with its SpiralCell Lead Plate Technology, will suffer much less from the occasional deep discharge (such as leaving your lights on) than a "standard" flat plate style battery would do.

Because of the fact that SpiralCell technology can store more energy for a given size of  battery, these types of battery are ideal for use in motor sport because a much larger "conventional" battery would need to be used in place of an OPTIMA to give the same starting current capability. And they don't leak, corrode, spill, have very low self discharge rates, and can be mounted any way up!

 
**Click for Technical Information page for for more details and Dimensions or download the .pdf files below **
 

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*Click here to go to Technical Information page for for more details and Dimensions or download the .pdf files below **
Red Top 6V-2,1L £ Call - not available until June Optima RedTop 6V2,1L starter battery with SAE top terminals. Designed for use in heavy equipment installations and old vintage cars requiring a high power 6 Volt batter. Two 6 Volt batteries are often used for weight distribution purposes in racing and high performance cars since OPTIMA can be installed on its side permanently. Brochure in .pdf-format	Technical specifications Length: 254 mm Width: 84 mm Height: 195mm Minimum weight (kg): 8,4 kg Nominal Voltage: 6 V Cranking Amps (SAE): 980 CA Cold Cranking Amps (SAE): 800 CCA Cold Cranking Amps (EN): 815 CCA Reserve Capacity: 104 minutes Capacity (C/20 rate): 50 Ah Internal Resistance: 3,0 mOhm
RedTop U-4,2L Same as S-4,2L below, but with side, front terminals £212.00 Total, includes delivery mainland UK (Not northern Scotland) The OPTIMA 4,2L is the original SpiralCell battery in the OPTIMA family and was introduced on the US market in 1987. Optima RedTop starter battery with SAE top terminals and GM side terminals. American group size 34. Suited for heavy equipment installations and high performance cars requiring a Gr 34 size battery. Brochure in .pdf-format          CURRENTLY NOT TRADING	Technical specifications Length: 254 mm Width: 173 mm Height: 195 mm Minimum weight (kg): 17,6 kg Nominal Voltage: 12 V Cranking Amps (SAE): 980 CA Cold Cranking Amps (SAE): 800 CCA Cold Cranking Amps (EN): 815 CCA Reserve Capacity: 104 minutes Capacity (C/20 rate): 50 Ah Internal Resistance: 3,0mOhm
RedTop S-4,2L £208.00 Total, includes delivery mainland UK (Not northern Scotland) Optima RedTop S-4,2L starter battery (as U-4,2L above, but without side, front terminals) with SAE top terminals. Designed for use in heavy equipment installations and high performance cars requiring a Gr 34 size battery. Brochure in .pdf-format             CURRENTLY NOT TRADING	Technical specifications Length: 254 mm Width: 174 mm Height: 195 mm Minimum weight (kg): 17,2 Nominal Voltage: 12 Cranking Amps (SAE): 980 Cold Cranking Amps (SAE): 800 Cold Cranking Amps (EN): 815 Reserve Capacity: 104 minutes Capacity (C/20 rate): 50Ah Internal Resistance: 3,0 mOhm
RedTop S-3,7L (Top terminals only - electrically similar to U-3,7L above) £175.00 Total, includes delivery mainland UK (Not northern Scotland) Optima RedTop starter battery with SAE top terminals. American group size 35. It is suited for midsize heavy equipment installations and US cars requiring a Gr 35 size battery or similar.   Brochure in .pdf-format            CURRENTLY NOT TRADING	Technical specifications Length: 239 mm Width: 162 mm Height: 191 mm Minimum weight (kg): 14,4 Nominal Voltage: 12 Cranking Amps (SAE): 910 CA Cold Cranking Amps (SAE): 720 CCA Cold Cranking Amps (EN): 730 CCA Reserve Capacity: 90 minutes Capacity (C/20 rate): 44 Ah Internal Resistance: 3,0 mOhm

Will it fit my car/van/truck?
Optima's were never designed to be "direct" replacements for a standard production vehicles battery. Whichever one you choose, be sure that it can be fitted! The responsibility for this is yours, and yours alone!  - If you cannot fit it, it cannot be returned, because there can be no guarantee that it has not been used. Therefore it becomes un-saleable!  You wouldn't like to receive a battery that has been "used" would you!

They come only in the sizes and specifications above. This is because they have such low internal resistance even the small size 3.7L batteries can produce huge starting currents and they will start any normal car!

They were intended to be used in "special" vehicles with specific "difficult" battery needs. They will undoubtedly be a major improvement over your "normal" standard automotive battery, (as well as some of the Optima "pretenders!) but may need some minor adjustments or fabrication to the hold down clamps or terminals/cables etc to fit your vehicle. If you are unlucky, both! If you are lucky it will just fit right in! 

It may happen that the terminals are the "wrong" way around for your car. This is pretty easy to solve simply by turning the battery around. Or it can be fitted on its side!  If the terminals are not the correct type then "converters" that go from Round DIN style, to the square bolt on type are available from places such as Halfords in the high street.

Download the pdf files to check measurements etc. Be sure! If you are not sure then get an Auto electrician or a qualified person to advise you.

Also, this link to the manufacturers website may help you.

www.optimabatteries.se/installation_guide/automotive/
www.optimabatteries.se/installation_guide/

General (conventional) Starter Battery FAQ by Bill Darden
 

Email - enquiries@optimabattery.co.uk